14 CFR Part 39, Airworthiness Directives
Section 01: Organizations & Authorities
Definition
The FAA regulation governing Airworthiness Directives (ADs), which are legally enforceable rules that apply to aircraft, aircraft engines, propellers, and appliances when an unsafe condition exists and that condition is likely to exist or develop in other products of the same type design. ADs prescribe mandatory inspections, modifications, operating limitations, or other corrective actions. Non-compliance with an applicable AD renders an aircraft unairworthy.
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